Fig. 4. Meshed model of a canaliculus showing the placement of microvilli within the lumen. Contours were separately drawn for the canaliculus and each of the microvilli, and the two sets of images were merged together in the meshed model of the entire apical surface. For clarity, a lighter blue was used for the microvilli. (A) Transverse section through a canaliculus with part of a surface removed. (B) Rotation of the model 90° to provide a transsectional view of microvilli projecting into the lumen of the canaliculus. Bar, 0.5 µm.